Walter s



W. S. WADSWORTH. VALVE GRINDING TOOL. APPLICATION mun MAY 9. ms,

1 3 1 0, 640. I Patented July 22, 1919.

" ill um vwemtoz UNITED sTATEs PATENT EEio WALTER s. WADSWOR'IH, or EASTEND, SASKATCHEWAN, CANADA.

VALVE-GRINDING- TOOL.

Application filed May 9, 1918. Serial No. 233,489.

,To all whomz't may concern: I

Be it known that I, WALTER S. WADS- WORTH, a citizenof the Dominion of Canada, residing at Eastend, Province of Saskatchewan, Dominion of Canada, have invented certain new and useful Improvements in Valve-Grinding Tools, of which the following is a specification. a j

This invention relates to an improved valve grinding tool for internal combustion engines and has as its primary object to pro vide a simple and 'eflicient device of this character which maybe operated in close quarters. .t l

The invention has as a further object to provide a tool employing a. rotatable stem and wherein the stem may be tilted with respect to the bit of the tool so that the stem may, in the practicaloperation of the device, be inclined with respect to the bit without affecting the engagement of the bit with the valve and without affecting the uniform grinding of; the valve. 7 7

And the invention has as a still further object to provide a tool wherein the bit may be readily detached so that various types of bits may be'employed in connection with the tool to meet the requirements of different makes of valves. I

Other and incidental objects will appear as the description proceeds. In the drawings wherein I have illustrated the preferred embodiment of the invention, and wherein simi- ,tionof the tool and lar reference characters designate correponding parts throughout the several views. Figure 1 is a plan view particularly bringing out the manner in which the toolis operated. a V I Fig. 2 is a fragmentary sectional view par ticularly illustrating the details of construc- Fig. 3 is a fragmentary sectional view 1 1. showingthe use of an extension section upon the stem. for grinding the; valves of an L- .type of motor of conventional design.

.In carrying outthe invention Iemploy a relativelyshort stem 10 upon the upper end 1 of which is swiveled a head or handle knob 11. Projecting laterally from the stem at a point substantially midway of the ends thereof is an arm 12 formedat its outer end Specification of Late. mesa.

Patented July 22, 1919.

with an eye 13 and pivotally engaging With the said arm is an operating rod 14.- provided at its inner end with a laterally directed terminal l5 loosely fitting through the said eye and receiving a cotter pin or other suitable fastening device connecting the rod with the arm. Adjacent its lower extremity the stem 10 is mediall slotted to define spaced fork arms 16 and oosely fitted in the said slot between these fork arms is a bit 17 connected with the stem by a pivot pin or key 18 loosely 'fitted through one of the said fork arms and through the said bit and threaded into the other of the said fork arms. The said key will thus pivotally support the bit upon the stem and preferably the said key is, at its outer extremity, provided with a laterally directed terminal so that the key may thus be readily connected with the stem or detached therefrom. Consequently, the bit 17 may be readily removed. The bit is, as particularly shown in Fig. 2 of the drawings, in the nature of a flat plate provided with an arcuate upper edge and formed at its lower edge with spaced work engaging lugs 19 adapted to fit in the spaced spanner wrench sockets usually found in the conventional type of internal reason the bit 17 is made readily detachable so that other bits may be selectively employed in connection with my improved tool to meet the varying requirements of practically all different makes of valves.

In Fig. 2 of the drawings, I have shown the device in connection with a conventional internal combustion engine valve 22. The lugs 19 of the bit 17 of the device are engaged in the spaced sockets of the valve when, as will be readily understood, one hand of the operator may be rested upon the knob 11 while the rod 14 may be grasped in the other hand and the rod reciprocated for grinding the valve. In practical use it is not always possible, owing to the lateral stress exerted through the operating rod 14 whenmoved to oscillate thestem 10, to maintain the said stem in exact vertical position axially of the valve and, furthermore, this is also often rendered. impossible owing to the presence of different engine parts adjacent to the valve of the engine. However, since the stem may freely swing with respect to the bit, unintentional tilting of the said stem with respect to the bit will not molest the engagement of the bit with the valve, while, at the same time, pressure upon the handle knob 11 of the tool will be communicated through the said stem and through the bit for constantly pressing the valve against its seat. Alike result will, of course, follow in any instance where it is found necessary to tilt the stem with respect to the bit in order to efi'ect the grindingoperation and in this connection it is to be noted that even though the stem is tilted with respect to the bit, the downward thrust upon the bit will be distributed by its spaced work engaging lugs to the valve in a manner tending to uniformly grind the valve throughout its circumference. While the bit is formed with a curved upper edge to permit of considerable rocking movement of the stem with respect to the bit, this edge of the bit is, nevertheless, adapted to engage at its ends with the inner end wall of the slot in the stem for limiting the stem in its tilting movement with respect to the bit. Gonsequently, in the practical use of the tool the stem cannot, when pressure is being applied against the handle knob 11, teeter to inoperative position with respect to the bit.

In Fig. 1 I have shown the manner in which the rod 14 is preferably operated for grinding the valve. As suggested by the arrows, the arm 12 is first rocked back and forth as far as will be permitted, with the operating rod disposed in a plane at one side of the stem 10 for oscillating the stem to rotate the valve. The operating rod is then disposed to extend in a plane at the opposite side of the stem and again oscillated back and forth as far as possible.

Thus, the valve will be rotated throughout the major portion of a complete circle for efiectually grinding the valve. The rapidity of oscillation of the operating rod may, of course, be varied for developing the greatest ease of movement and effective results according to the varying conditions of practical use.

In Fig. 3 of the drawings I have shown the stem 10 of the device equipped with an extension section 23 adapting the tool for use in grinding the valves of engines of the L-type. In this figure a portion of such an engine has been conventionally shown at 24c and one of the valves of the engine at 25; Formed through the engine head above this valve is the usual opening 26 through which the valve may be removed, this opening, of course, being normally closed by a suitable plug therefor. At its upper extremity the extension section 23 of the stem is provided with a cylindrical socket 27 adapted to receive the lower extremity of the stem 10, the bit of the stem being, of course, removed. Formed through one side of this socket is a suitable opening and the key 18 is inserted throughthis opening and then engaged with the stem in the manner previously described for detachably connecting the extension section with the stem to rotate therewith. Adjacent its lower end the extension section is medially slotted to provide fork arms 28 similar to the fork arms 16 of the stem 10. These fork arms are thus adapted to receive the bit 17 therebetween and pivotally connecting the bit with the said fork arms-is a pivot pin or key 29 similar to the key 18. This key 29 is loosely fitted through one of the fork arms and through'the bit and is then threaded into the other of the fork arms in a manner similar to the key '18 for detachably connecting the bit with the extension section. It will thus be clear that the extension section 23 may, as shown in Fig. 6, be inserted through the opening 26 of the engine cylinder head to engage the bit ofthe section with the valve 25 when the tool may be operated, as previously described, for grinding the valve. 1 consequently rovide a tool which may be readily employe for rinding valves ofvarious different types of motor vehicle engines.

' Having thus described the invention, what is claimed as new is:

1. A valve grinding tool including a stem formed of upper and lower sections, fork arms formedon the lower terminal of the upper section and adapted to pivotally support a bit therebetween, a socket formedon the upper terminal of the lower section and removably receiving said fork arms, means engaged with the socket and said arms and connecting the sections, a bit carried-by the lower terminal of the lower section, and means for oscillating the stem, thebit being adapted for pivotalconnection to the fork arms by said means when the sections are separated.

2. A valve grinding tool including a stem formed of mating detachably connected sections, means carriedby each section for pivotally supporting abit whereby the ef fective length of the stem may be varied, and means for oscillating the stem.

3. A valve grinding tool including astem formed of, mating separablesections, means carried by each section for pivotally. supporting a bit whereby the effective length of the stem may be varied, means detachably connecting the sections and adapted-to pivprovided with a fork and the other provided with a socket removably receiving said fork, a pin extending through the wall of said socket and threaded into one of the arms 01 of the fork of the first section and said in being adapted to pivotally connect the it with said fork arms when the sections are 10 separated.

In testimony whereof I aifix my signature.

WALTER S. WADSWORTH. [In 8.5

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G. 

